The Collaborative International Dictionary
Irrefragability
Irrefragability \Ir*ref`ra*ga*bil"i*ty\ ([i^]r*r[e^]f"r[.a]*g[.a]*b'l), n. The quality or state of being irrefragable; incapability of being refuted.
Wiktionary
irrefragability
n. How irrefragable something is.